I'll take my PPQ over a glock any day of the week. I'm actually in process of taking pictures, writing, and editing a full review and comparison of the Walther PPQ.
I do enjoy my P22 for some very light shooting and critter control. I'd like to get my hands on a P99 and possibly a PPX as well. It'd be nice to complete the line.
My only gripe about my PPQ is the magazine release. I, unfortunately, purchased mine a little too late in the game and have a PPQ M2. This model has the standard 1911 style push-button magazine release. I much prefer the European style on the trigger guard, just like my P22 and my H&K P30.
What are your thoughts on the P99? I know the trigger isn't nearly as nice and the ergonomics are a little different, but I'm told that they have a nice "natural point" to them. I've seen them for sale pretty cheap and I thought it'd be a nice addition if the price is right.